Barriers to Optimal Child Sleep among Families with Low Income: A Mixed-Methods Study to Inform Intervention Development

This study gathered formative data on barriers to optimal child sleep to inform the development of a sleep intervention for parents of preschool-aged children in low-income households. Parents (n = 15, age: 34 ± 8 years, household income: $30,000 ± 17,845/year) reporting difficulties with their child’s sleep participated in this study. Mixed methods included an online survey and semi-structured phone interview. Items assessed barriers/facilitators to optimal child sleep and intervention preferences. Interview transcripts were coded using inductive analyses and constant-comparison methods to generate themes. Derived themes were then mapped onto the Theoretical Domains Framework to contextualize barriers and inform future intervention strategies. Themes that emerged included: stimulating bedtime activities, child behavior challenges, variability in children’s structure, parent work responsibilities, sleep-hindering environment, and parent’s emotional capacity. Parent’s intervention preferences included virtual delivery (preferred by 60% of parents) to reduce barriers and provide flexibility. Mixed preferences were observed for the group (47%) vs. individual (53%) intervention sessions. Parents felt motivated to try new intervention strategies given current frustrations, the potential for tangible results, and knowing others were in a similar situation. Future work will map perceived barriers to behavior change strategies using the Behavior Change Wheel framework to develop a parenting sleep intervention.


Introduction
Adequate sleep is essential to multiple domains of child development. Suboptimal sleep is linked with a range of detrimental child health outcomes, such as increased cardiometabolic risk and lower diet quality, as well as poor cognition and lowered psychosocial well-being [1][2][3]. Currently,~33% of preschool-aged children do not receive the recommended amount of sleep per day, while~50% of children in poverty do not obtain sufficient sleep [4]. Thus, interventions aimed at reducing these striking sleep disparities are crucial for sleep health equity and disease prevention.
Early childhood is an optimal time for the primary prevention of suboptimal sleep. Social, cognitive, and physical competencies that are important for adaptive functioning emerge rapidly during early childhood and are supported by healthy sleep patterns [5]. At the same time, bedtime resistance, night wakings, co-sleeping, and variability in daytime naps are common in young children and impact overall sleep health [6]. These factors warrant important developmental considerations when designing interventions to promote optimal sleep during the preschool years [7]. Despite the importance of healthy sleep habits during this period of development, preventive interventions to improve sleep in early childhood are lacking. Existing sleep interventions have either focused on infancy, targeted clinical sleep disorders, or included sleep as one aspect of a multi-component intervention targeting several health behaviors [8]. Thus, it remains unknown if targeting sleep alone during early childhood results in improvements in related health domains (e.g., diet) that collectively prevent later-life cardiometabolic disease risk.
Few behavioral sleep interventions have also included families with low income, for whom preventive interventions may be especially beneficial [8,9]. Thus, to diversify the populations served, the inclusion of families with fewer resources should be prioritized using a purposeful approach that recognizes their unique challenges and needs. For example, thoughtful intervention design should consider multiple levels of influence on children's sleep, including the bedroom, home, neighborhood, and daycare environments [7]. Although various individuals within these settings may influence sleep patterns, parents have a central role in fostering the development of young children's healthy sleep patterns and routines [10]. As such, research must engage parents as key stakeholders by incorporating their viewpoints-and prioritizing their preferences-when developing interventions to support families.
As a first step, formative evidence is essential to understanding the various factors that influence sleep patterns across multiple domains in early childhood. This foundational evidence is critical to informing the design and delivery of effective interventions and maximizing the potential for their success [11]. Developmental evaluation is the first stage of the formative process and gathers community input on contextual barriers to the target behavior, as well as perceptions on the feasibility of implementation strategies for intervention delivery [12]. Currently, formative data on children's sleep are limited to infants [13] and older populations [14], or distinct conditions (e.g., cerebral palsy) [15], specific locations (e.g., hospital settings) [16], and singular ethnic groups (e.g., Latinx) [17], resulting in evidence gaps that warrant further evaluation.
The aim of this study was to conduct a mixed-methods formative evaluation among parents with low income to identify perceived barriers to optimal child sleep in preschoolaged children. Parents' motivations for participating in future interventions and their preferences for intervention delivery were also explored. These data will be used to inform intervention development to improve child sleep in under-resourced families, with assessments on outcomes across multiple health behaviors (e.g., diet) linked to cardiometabolic disease risk. Given the exploratory nature of this study design, no a priori hypotheses were specified.

Study Design
This mixed-methods study used a concurrent triangulation design [18]. Priority was placed on qualitative data, and complementary information was provided in a quantitative context. Upon enrollment, parents completed an online survey, followed by a semi-structured phone interview. All study procedures were approved by the university's Institutional Review Board.

Participant Recruitment
Parents (n = 15) were recruited between March and June 2022. The sample size was selected based on principles of qualitative research as an estimate for reaching saturation and sufficiency in the interview data [19]. Flyers were posted in pediatric clinics, in childcare newsletters, and on childcare social media sites. Interested parents were directed to a study webpage where they completed an eligibility screener. Parents had to (1) be ≥18 years of age; (2) have a child 2-4 years of age; (3) be a primary caregiver (i.e., child lived in their home ≥50% of the time); (4) earn a household income <200% of the Federal Poverty Line [20]; (5) report their child had trouble sleeping [21]; and (6) express interest in improving their child's sleep. Parents were excluded if their child had a diagnosed sleep disorder or medical condition that significantly impacted their child's sleep (e.g., epilepsy, sleep apnea). Primary caregivers who were not biological parents (e.g., grandparents; aunt) were considered eligible; however, only mothers and fathers enrolled in this study. For multi-parent households, only the interested parent who completed the study screener was interviewed. This sample was selected to represent parents with lower income, who would likely enroll in a behavioral sleep intervention for subclinical child sleep challenges.

Quantitative Survey
Upon enrollment, parents completed an online survey, lasting~20 min. Survey items included demographics, the home environment, child sleep quality, current sleep guidance, and intervention preferences. The validated Child Sleep Wake Scale (CSWS) [22] was used to contextualize child sleep quality. The CSWS consists of 25 items, with response options rated on a 6-point scale, ranging from "Never" to "Always". Five subscales (going to bed, falling asleep, maintaining sleep, reinitiating sleep, and returning to wakefulness) and a total sleep quality score were derived from select items [22]. Possible scores ranged from 1 to 6, with higher scores indicating better sleep quality in each domain. Survey items related to the home environment, parent's receipt of sleep guidance, and intervention preferences were developed by the research team. These items assessed factors such as household level noise, presence of screens (e.g., phone, television) in their child's bedroom, current sources of sleep guidance, sleep challenges parents struggle with most, parents' interest in a child sleep intervention, preferred delivery mode, and ideal intervention length.

Qualitative Interviews
A semi-structured interview guide was developed to elicit parents' perceived barriers/facilitators to child sleep, and motivations/preferences for future intervention delivery. Interview questions addressed various aspects of sleep (i.e., nighttime sleep, night wakings, morning routines, naps), environmental contexts (i.e., bedroom, home, and neighborhood environments), salient challenges, motivations to try new intervention strategies, and intervention preferences. The interview guide was refined through an iterative process of peer debriefings and preliminary interviews until a final guide was reached (See Supplementary File S1) [23]. Two researchers (ERS, ELA), trained in qualitative methodology, conducted practice phone interviews with parents not enrolled in this study (n = 4) [23]. Parent feedback was elicited to strengthen the clarity of the interview questions and enhance alignment with the research aims. The same two researchers then conducted primary interviews with enrolled parents that lasted~40 min each. Interviews were audiorecorded and transcribed using an online transcription planform (Otter.ai; accessed on 2 January 2022).

Conceptual Approach
The Theoretical Domains Framework (TDF) [24] was used to contextualize perceived barriers from the qualitative interviews. TDF was developed through a synthesis of 33 theories on behavior change, which distilled 84 theoretical constructs into 14 clustered domains [25]. These 14 domains provide a validated taxonomy of implementation determinants across cognitive, affective, social, and environmental influences for a target behavior. For example, the TDF domain of behavioral regulation pertains to barriers around self-monitoring, breaking a habit, and action planning, while the domain of environmental context and resources pertains to barriers in the environment and available resources. TDF was chosen as a guiding framework, given its extensive evidence base [26], and its ability to guide future intervention development by mapping behavior change strategies to associated barriers using the Behavior Change Wheel Framework [27].

Quantitative Analyses
Descriptive statistics were used to analyze quantitative survey items. Continuous variables were tested for normality using the Shapiro-Wilk test. Most variables were normally distributed, with the exception of child age, and CSWS variables for the amount of time children resisted bedtime, the amount of time to fall back to sleep after waking in the night, and time to become alert in the morning. As such, all continuous variables were reported as means ± standard deviations and median (interquartile range [IQR]). Categorical variables were reported as percentages. Analyses were conducted in SAS Studio version 3.8 (SAS Institute Inc., Cary, NC, USA).

Qualitative Analyses
Interview transcripts were imported into NVIVO version released in March 2020 (QSR International, Burlington, MA, USA). Authors (ELA, AE, PM) trained in qualitative methodology generated themes using inductive analysis and an immersion crystallization approach [28][29][30]. Aligning with the phases of thematic analysis [31], two coders (AE and PM) read all transcripts and independently generated initial codes using recurring words, phrases, and themes. Coders then met with a third reviewer (ELA) to integrate and add codes into a comprehensive coding guide and settle any discrepancies. Subsequent transcripts were reviewed to determine if additional codes were needed. This iterative process was repeated until all transcripts were read, and coders agreed saturation had been reached using a "code meaning" approach [32,33]. Saturation reached transcript #11. Themes were then generated via collaborative discussions among coders using a constant-comparison method [28] and independently verified by all coders to ensure data consistency and integrity. Finalized themes on barriers to optimal child sleep were then mapped onto the TDF, as described above.

Trustworthiness of Findings
Prior to data collection, all coders engaged in a reflective process to examine personal biases and assumptions associated with this work [34]. Personal value systems were explored and areas for potential role conflict were identified. This process resulted in written positionality statements to acknowledge personal subjectivities [34]. During the phone interviews, rapport was established at the onset, and parents were encouraged to be honest and frank. Parents were told they were not required to share information they preferred to keep private, and iterative questioning was used to clarify contradictions for greater transparency [35]. To establish clarity of the research findings, peer scrutiny was conducted with a researcher not involved in transcript coding or theme generation (ERS). Their feedback was incorporated to modify and strengthen theme development. Frequent debriefing sessions were held during the analysis phase to resolve disagreements and achieve a consensus on the interpretation of participant responses [35]. Lastly, quantitative data were triangulated with the qualitative findings to result in a holistic understanding of the research questions [18].

Demographics, Home Environment, and Child Sleep Characteristics
Parent and child demographics are listed in Table 1. About half (53.3%) of children had access to screens in their bedroom at night; and of these, 62.5% had screens on when they fell asleep. Many children had at least one sibling that slept in the same room (60%) or the same bed (40%) with them at night. Most parents described their home as quiet (86.7%) and their neighborhood as safe from crime (93.3%). Sources and topics for child sleep guidance and areas parents struggle with most are listed in Table 2.  Response options were select all that apply. Values may sum to >100%; a One parent selected "other" and reported books; b One parent selected "other" and reported night weaning.
The CSWS indicated children resisted bedtime for an average of 48.7 ± 44.3 min/night and took 62.3 ± 52.7 min to fall asleep. Children woke an average of 2.0 ± 1.1 times/night and took 30.9 ± 62.8 min to fall back asleep after waking. In the morning, children took an average 29.4 ± 38.5 min to become alert. Values for CSWS subscales averaged 2.5 ± 0.9 (going to bed), 3.1 ± 1.1 (falling asleep), 3.9 ± 1.1 (maintaining sleep), 3.9 ± 1.1 (reinitiating sleep), and 3.4 ± 0.8 (returning to wakefulness). Total sleep quality scores averaged 3.4 ± 0.7. For context, another sample of good and average sleepers had total scores of 5.2 ± 0.4 and 4.3 ± 0.4, respectively [22], suggesting this study's sample comprised lowerthan-average sleepers. Median and IQR values for the CSWS variables in this sample are listed in Supplementary File S2.

Barriers to Optimal Child Sleep
Six themes emerged from the qualitative data related to barriers to optimal child sleep. Each theme was mapped onto associated TDF domains, as described in Table 3, and indicated in parentheses next to the representative quotes below. When describing what activities were typically performed before bed, parents often mentioned stimulating activities. Most often, this included watching television as part of a bedtime routine or their child falling asleep when outside of the home while attending activities (e.g., a sibling's baseball game). Some parents used television as a means of soothing their child or in response to their child's behavior.
"I'm terrible at routines. We could be out somewhere, and my son might fall asleep in the car on the way home and never wake up."

(Belief about capabilities)
"Everybody's TV is cut off, except for [my youngest child's]. Because if her TV is not on, she will scream."

(Behavioral regulation)
"He's a little resistant to turning off the TV, so we'll just turn it to a YouTube channel that has lullabies, and you know, the fish swimming in the water to try and calm him down." (Behavioral regulation)

Theme 2: Child Behavior Challenges
Behavioral challenges, such as child resistance or hyperactivity, were described as sources of variability in bedtime routines. During nighttime wakings, some parents also mentioned difficulty in getting their child back to sleep due to resistance in going back to bed. Parents described variability in daily structure as influencing child's sleep schedules. Structure was considered pre-planned activities or established routines [36]. Sources of structure could be external influences (e.g., childcare) or the extent of routines within the home (e.g., varying rules when living between two households). At times, structure promoted optimal sleep (e.g., attending daycare); while at other times, planned activities hindered ideal sleep schedules (e.g., sports events late at night). Some parents seemed to have lower-priority goals and intentions around maintaining routines when structure varied (e.g., weekdays vs. weekends).
"On the weekend, we sleep in. We lay around in our pajamas. On most days that we don't have an activity planned, that's what we do."

(Intentions)
"If we had something else to do, like we went to the zoo or to my parents, and we're coming home late in the afternoon, it's a pretty much a done deal that he's going to fall asleep."

(Goals)
"[Naps are] definitely more consistent at daycare. At home, the range is a lot wider." (Environmental context and resources)

Theme 4: Parent Work Responsibilities
For some parents, work obligations contributed to varying sleep schedules, such as if a parent came home late and routines shifted. Parents' work was also mentioned as a possible barrier to trying new sleep strategies given a lack of time.
"My husband and I are both entrepreneurs, so we work when we can. We still have work to do by the time he's back from daycare, and sometimes that can change the routine." Some parents described the bedroom and home environments as not promoting optimal sleep, such as high levels of noise or co-sleeping with their child. At times, this was environmentally driven with multiple children in the same bed or creating noise at night. Other times, parents reinforced co-sleeping, or felt they could not break a bedsharing habit.
"It can sometimes get noisy having babies in the house . . . last night, they decided they were going to refuse to sleep at 1:00 am, and they were up screaming until 3:00 am."  "If you've had a long day, and are out of gas, and don't feel like you want to, you're just not being consistent. That's definitely a challenge."

(Emotion)
"It depends on my day . . . I work in the heat. Sometimes I'm tired. Honestly, sometimes I come home and crash, and then I take care of him." (Emotion)

Facilitators to Optimal Child Sleep
When asked what strategies were useful and effective for managing child sleep challenges or what promoted greater sleep consistency on certain days, 4 themes emerged. These included: soothing activities, preparation and action planning, establishing routines and limits, and creating a soothing environment.

Theme 1: Soothing Activities
Many parents incorporated some soothing strategies in bedtime routines and when their child experienced frequent night wakings, such as reading books, playing soft music, and rubbing their child's back.
"It's probably around 9:30 or 10:00 by the time she feels sleepy, and we are done with our songs. After that, she asks for books. Then we read stories until she falls asleep." "I'll put him back in bed, in the position that he usually falls asleep in, and I'll maybe rub his back for a little bit."

Theme 2: Preparation and Action Planning
Some parents used pre-planned strategies and tools, such as alarms, to try and promote routines for more consistent sleep and signal when certain activities should begin.
"Pre-planning and having everything ready. Pajamas out and everything kind of lined up definitely helps move things along." "Setting an alarm on my phone or just being aware of the time and starting the routine at that time."

Theme 3: Establishing Routines and Limits
Some parents created structured routines and established rules to minimize sleep challenges. Often this was motivated by children's resistant behavior if routines were not in place. These strategies indicated parent's knowledge of the benefit of routines and setting limits.
"We're trying to have a more consistent routine. Or the routine we have, just implementing it more consistently. I think that helps." "I developed a green light, yellow light, red light type thing. I put it close to where he was. He had consequences if he wouldn't stay in his room or was being too loud. That seemed to help. If he stayed on green, the next day he got a little prize."

Theme 4: Creating a Soothing Environment
While some parents mentioned natural sleep-promoting environments, such as quiet neighborhoods and minimal light, other parents used strategies to minimize environmental noise after their children went to bed, as to not disrupt their child's sleep.
"The neighborhood where we are located is really peaceful and quite." "[My husband] will watch something on his phone with his headphones in."

Motivations for Participating in a Child Sleep Intervention
Parents reflected on factors that would encourage them to participate in a child's sleep intervention. Three themes emerged, as described in Table 4. Parent's current frustrations were expressed as motivation to try new intervention strategies. Parents felt a desire to quickly see tangible results when trying new approaches and felt this would provide strong reinforcement to continue with an intervention. Parents also indicated a strong preference to receive advice from, and participate alongside, other parents with similar struggles to where they could relate. Parents reflected on the anticipated benefits of improving child sleep. Two themes emerged (Table 4) and included improved family-level sleep and emotional well-being. Parents felt their own sleep would improve, if they no longer experienced child sleep challenges, and this would result in greater alone time, marital dynamics, positive parent/child emotions, and family cohesion.

Intervention Preferences
Survey data indicated most parents (80%) would be interested in participating in a child sleep intervention. When asked if other parents they know would be interested, 40% reported yes, while 46.7% were unsure, and 13.3% said no. Virtual delivery (rather than in-person) was preferred by 60% of parents, with mixed preferences for the group (47%) versus individual (53%) sessions. The most realistic amount of time most parents (80%) could devote to each intervention session was 30-45 min.
Qualitative themes were derived for parent preferences for a prospective intervention (Table 5). Parents preferred a virtual delivery (rather than in-person), as it was more convenient, and minimized barriers around transportation, childcare, work, and other time commitments. Those preferring group delivery cited the opportunity to converse with other parents in similar situations as the primary benefit, while a few shared that their discomfort in social settings would limit their interest in a group intervention. Parents who preferred individual delivery mentioned the opportunity for more customized content that could address their specific needs and concerns, as opposed to general content that may apply to a wider range of families. Table 5. Qualitative themes on parent's preferred mode of delivery in a child sleep intervention. Data were from n = 15 parents in low-resourced households, with a child 2-4 years of age, who struggle with their child's sleep.

Themes
Description Representative Quotes

Virtual delivery
Flexibility and convenience Virtual delivery was described as more convenient and accommodating to schedules "I think the virtual environment is definitely easier this day and age for people to schedule around."

Minimizes barriers
Virtual delivery was thought to minimize barriers to participation "I would prefer it to be virtual, so I'm not having to get in my car and drive somewhere. You know, gas prices going up like crazy."

Social support
Group sessions would provide peer support from other parents "A group setting would be better . . . hearing other parents' struggles or other successful strategies they've implemented. That would be helpful to me along with, of course, the instructor."

Individual sessions
Personalization Individual sessions were described as more personalized to parent's needs "I would want to work with someone individually . . . my kid has very specific sleep issues for our family . . . I don't want to be in a class where I have to hear all those basics . . . I really just want somebody to work with his specific problems if I'm going to devote time to that." Social anxiety Some preferred one-on-one settings, due to anxiety being in groups "I don't like doing groups because I don't like talking in front of people."

Discussion
This study provided rich formative data on barriers and facilitators to optimal child sleep and parents' preferences for behavioral sleep interventions. Prominent themes included sleep routines, environmental contexts, parents' work and emotional capacity, and child-driven behaviors, which spanned 8 of the 14 TDF domains. Parents expressed a desire for future interventions to be relatable and produce tangible results, with motivation fueled by current frustrations and anticipated benefits in family-wide sleep and emotional well-being. Lastly, parents expressed an interest in virtual intervention delivery, given the ability to reduce barriers and provide flexibility. Collectively, this evidence can inform the development of prevention-focused sleep interventions among preschool-aged children for later-life disease prevention.
A central aspect of promoting optimal sleep is establishing consistent bedtime routines, with soothing activities conducted in the same order each night [37]. Bedtime routines can result in improved sleep [38] and positive developmental outcomes, such as emotional and behavioral regulation and family functioning [37]. Many parents mentioned the inclusion of both stimulating and soothing activities as part of their child's bedtime routine, such as television viewing and reading books, respectively. Television viewing before bed is common; yet, this has been shown to result in poor sleep, and subsequent child behavior problems [39]. Thus, evidence-based guidelines recommend setting positive routines, not allowing screens in the bedroom, and restricting screen viewing before bed [40,41]. Some parents indicated screens were used in response to behavioral resistance or hyperactivity, while other parents indicated this was part of their typical nightly routine. As such, behavioral interventions should consider promoting positive bedtime practices by empowering parents through the reinforcement of soothing activities before bed and strategies to address the intent behind family's current use of stimulating activities, such as behavioral management.
Structured settings are thought to promote optimal sleep by regulating children's bed and wake times [36]. Parents in this study felt that child sleep was more consistent when certain sources of structure were provided, such as days when children attended daycare or had planned activities. Wake times, nap schedules, and subsequent nighttime sleep seemed to improve when children had more regulated schedules. Contrary to this, weekends were often less regulated and included unscheduled activities that contributed to children being more likely to experience variable sleep patterns (e.g., irregular naps, sleeping in). At times, weekdays with planned extracurricular activities for older children (e.g., evening sport practices) resulted in less optimal sleep by delaying bedtime for their younger sibling. Shifts in sleep timing, such as large weekday-weekend differences, have been associated with less healthful dietary behaviors in older children and adolescents [42][43][44]. Thus, early childhood may be a critical time to establish positive, consistent patterns to prevent the development of associated negative health behaviors. Data from this study can inform interventions in supporting parents by setting intentions and implementing goals around maintaining consistent routines, to the extent possible, on days when structure naturally varies. For example, some parents mentioned time-driven tools, such as setting alarms, or prioritizing consistent routines to help with child sleep challenges. Tools such as these may be beneficial in maintaining consistent sleep routines (e.g., naps on weekends, bed and wake times on days when children do not attend childcare) to promote healthy sleep patterns and contribute to fewer sleep-related challenges.
Parent's feelings of stress and fatigue emerged as a prominent barrier influencing child sleep patterns. Parents' mental health is bidirectionally linked to child sleep [45], such that worse psychosocial health influences child sleep [46], and child sleep difficulties, in turn, influence parents' emotional well-being [47]. Parents mentioned stress and fatigue as rooted in external factors (e.g., work), as well as challenges around child sleep. They acknowledged that, if they were to no longer experience child sleep difficulties, they would anticipate beneficial improvements in their own sleep and psychosocial well-being. Given that low-resourced households are more likely to experience both higher levels of stress [48,49] and suboptimal child sleep [4], parents' emotional health must be considered within family-based interventions to promote optimal child sleep. Such considerations of parental well-being could result in holistic family-wide benefits, such as more positive parenting [50], consistent bedtime routines [51], and improved child sleep.
Many themes derived from this study align with previous work that has explored barriers and facilitators to optimal child sleep. For example, one study with focus groups among parents and their elementary-aged children also found that stimulating activities, such as technology, was a common barrier to later bedtimes [52]. For facilitators, consistent bedtime routines are beneficial for promoting sleep in all children, regardless of factors, such as family income or child age. In addition to findings that align with previous work, this study extends the current body of knowledge in numerous ways. First, barriers to child sleep were mapped onto TDF domains that directly inform subsequent intervention development. Interview data were used to derive situational context and parent intent to identify specific TDF domains that can inform evidence-based intervention strategies. Second, this formative work gathered intervention preferences and motivations from parents as key stakeholders. Third, younger children's daytime schedules and napping needs are more variable than older children [7]. Thus, results from this study pertaining to daytime factors (e.g., daycare) and napping influences are novel. Lastly, future work in this study will investigate how themes in families with low income are similar and distinct from those in higher-income households.
Stakeholder perspectives and viewpoints from the target population have become increasingly prioritized in intervention design to foster relatable content and provide impactful outcomes [53]. This study sought to understand parents' preferences for child sleep interventions, including the format, length, and mode of delivery. Results indicated variability in intervention preferences, though most parents felt virtual delivery offered greater benefits than in-person sessions. Digital interventions have become common in behavioral health to expand reach and reduce barriers to participation [54]. Parents in this study echoed this sentiment by mentioning virtual delivery would increase scheduling flexibility and reduce obstacles to their involvement (e.g., transportation). Preferences for individual versus group sessions were variable, indicating the need for interventions to offer multiple modalities that accommodate diverse circumstances and preferences. Benefits for group sessions included social support, while individual sessions were thought to provide tailored content and accommodate those with social anxiety in group settings. Collectively, parents seemed to prefer shorter intervention sessions (i.e., 30-45 min/session) which should be considered to enhance attendance and retention. Lastly, parents favored the idea of guidance coming from those who experience similar struggles, highlighting the importance of intervention delivery from relatable community members.
This study involved parents who perceived current sleep challenges and desired guidance to improve their child's sleep. As such, this sample likely has greater awareness of sleep-related issues and may be internally motivated for intervention participation. Results may not generalize to parents with less awareness of optimal child sleep patterns or to those who do not desire guidance. Conversely, families with known child sleep disorders or medical conditions that impacted their child's sleep were excluded, which limits the exclusion criteria to those with prescribed medical conditions. Eligibility criteria did not specify how long families had to be experiencing child sleep challenges; thus, future research should examine if parents' perceptions vary based on this factor. This study was strengthened by rigorous mixed methodology and the application of the TDF theoretical framework, designed to inform behavioral intervention development. The study population consisted of families with low income, which helps to address a knowledge gap in child sleep intervention research.

Conclusions
Parents experienced multiple barriers to optimal child sleep in their preschool-aged children, which spanned behavioral, environmental, and emotional domains. Child sleep challenges impacted other family members' sleep and emotional well-being; thus, parents were motivated to try new intervention strategies given current frustrations and the possibility for tangible results. Parents wanted future interventions that were relatable, with short sessions delivered virtually to minimize barriers and provide flexibility. This formative evidence will be used to support the development of future behavioral sleep interventions among families with low income to reduce sleep disparities and promote health equity for disease prevention. Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.

Data Availability Statement:
The data presented in this study are available on request from the corresponding author.